This was just a quick thought that I had in my head and I wanted to get it out there before I forgot the details.
I'm unsure as to what your plans are for the new blocks with 1.13, but I feel as though you should add all the new 1.13 sea blocks in the water around the RI acting as atolls, and since Kalros is such a bad RI, I'd also like to suggest adding the ability to get all the prismarine blocks there and only there (besides dockblock.)
I also feel you should put atolls randomly in the ocean in all 5 continents, giving a purpose to go into the water besides trying to find a way to get the Explorer title.
I'm unsure as to what your plans are for the new blocks with 1.13, but I feel as though you should add all the new 1.13 sea blocks in the water around the RI acting as atolls, and since Kalros is such a bad RI, I'd also like to suggest adding the ability to get all the prismarine blocks there and only there (besides dockblock.)
I also feel you should put atolls randomly in the ocean in all 5 continents, giving a purpose to go into the water besides trying to find a way to get the Explorer title.